#include<stdio.h>
int main()
{
    int a = 10;
    int b = 3;
    double d = a / b;
    printf("%f\n", d);
    d = 5 / 2;
    printf("%f\n", d);
    d = 5 / 2.0;
    printf("%f\n", d);
    d = (double)a / b;
    printf("%f\n", d);
    return 0;
}
